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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d576d238e80fea679a04d6b92b9d01f99b586840b50f0e4dae404d16512686a' 
  AND token = 'MtNbz+le8wkNaMJDT9bs1QimDiXgSzHIaT09As13M8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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