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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906924d07eb9b30336ca23e36f76305e35eec3509d8c472bc2821883db246563' 
  AND token = 'jTk4XyMlFODT4js08+Eh506WAlhPE5ILtLjZW38OqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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