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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87f3f81128cfa639301975a3dac391741e18de4330ccef5ea045a95023dfc29' 
  AND token = 'ybsnUwylDe9+k175JyFzgyaxP8TT57aiYCsNo0Rm6p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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