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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7883e90e3041ceebc8c47bb98642e1196b90a07fbcdd39f47ef28556c0cda5ea' 
  AND token = 'zWrzL6AQjEgMtgg6SxMCRHJTzvZ26XcAZ1PllC2OtPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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