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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5b3572262a9c720f876c5f53d52fb0efecfa9d13ce88beb6f745fbe75d23dc' 
  AND token = '/jiV8v1Rn7fRSLRTJzUyq8n/4CHQLyHnUbN3pYUlqhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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