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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7283944d43311aef07eeeafff5f5b292d3b5e298d2963c4d8d9ac45bd402889b' 
  AND token = '4+VDw4dT97PlsZfoq2mjbCPNICLx8bG374ntQDZF+w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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