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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731fd83750226b4e91613999c0e27fe5cb9be655ca94188be9a97f2fe5ed534e' 
  AND token = '+dFelwmeRX+r5SMRs0TTuVxadWSsPyTTT127fPEt9F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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