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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c640d989aa14afc9bf24a5ad122997e158db4ba6bd73e7c21853592b2e59642' 
  AND token = 'wAFAGmvjgbO2OAKmd0dakt5AXd8MFLQMA1aFrAIrQI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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