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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9087cabfcce00ad0558bae017547358805c425bed5089f6665e9604e842753e2' 
  AND token = 'q45aVbABv8yCDhbobaQfuMS8hjcHoOh1rXOE8Gjulvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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