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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b248c07ea4b808fef2056ae9ef58d12229d62cb35bf9f43b4664d5da990dd34' 
  AND token = 'M4dCIMjo4zrQaE3mmWXYPfv9yUG8gWUW/4g/WIc4GgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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