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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cb8d52d4731b2665b1a08be992fb95f79f3b29940a446db844a97c4fcc5a78' 
  AND token = 'gbOdMKvva2cA4Y5nObsVt24DnPVRC1+RUfFMi/IuHCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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