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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da1fa0e51819903de2400851c524f07b7bdd09a8b754050fb5ca6a4164ee063' 
  AND token = '867K6dMp4LDmGiII22MmJ3ytBKGXFN9fDwDZQX7g5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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