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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d688e9aafe4d4e7bc4571ae7a7f6db9d6968bc718ec5593f874e9f5a11031e' 
  AND token = 'cWBu8d3QqPIu8PWgaGS2hKmCWappFgk6uytsiCZKXBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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