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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be69687c4f0616fd93f2d5b497f69cbd50b2e22c62e1404c7d81f393620fc556' 
  AND token = 'jmjD2Frt8nu6EMUuXtubjlwL7QudFtMLV3i8bn5Arvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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