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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc4ef68fc8e6f07d1d5bac5da051bdf0bfdb11535c5486f48a67d5a87ec1b3e' 
  AND token = 'PgcYii6HXHHqkVTT7pTcDm5uOSiM5Iodi7hMRfk0x5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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