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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c08efba2941667d449f52b2aa4777705862ba0453b3a5071f68501617882252' 
  AND token = '/qWf8Ajhv4nZTR0TBo0dlEa4LftFjYeB9aMr2wdKLJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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