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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada66f7ce8d70571e7596f122303bdcbdb9e27c415a0fa384fd22cc6a92979ca' 
  AND token = '8HvyEqQ7SA5ZI1IVE1c8HIvDWF43em+ND+JWkQ1Cl4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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