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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d2f90dd600f7bb76e607b889b9d73cb9eb98572c448fe9c4c2e399f9846aa3' 
  AND token = '7NjcVoPQ1+2Jh/ww4OsS5USMniAgd076bZaIdFqLFHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}