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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd769161e03d5139672a1c745d490ac8e01fc6b40d2861f422ba96cedf6004d78' 
  AND token = 'PSemtEnbcekLY8iC/AMfx2a6lyaovNA0YlmFQaKn0nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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