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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130873c84876496dacfd78163f4c6c2f6c7782f3c3ed03f2e222bdf3fcaf7ef7' 
  AND token = '92EhH1rT7wZAf1pUINV5taJAcLu9p9rO/38qCTIXhEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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