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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a894dfe321fe570d24a9a13c4b8d88aa61075fdd158a1c83b1d7e9c8f8b63a' 
  AND token = 'iRf59E85heA6x6VTfnnWNSLnfplVRFM5mHHZI+NXCZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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