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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b438296d5c04a54e3ea6c91b70f84a824007c0a388bce84c66882fa13c8f50cc' 
  AND token = 'ZlyWpB7vVhvfGxKX+hbnLhoaukrUkq3bVvC0n+O++m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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