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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df64be213ee6c531f79ed2ff5ff88bea9cad2f20a53b3ca93edbeef6b84e63e' 
  AND token = 'dmmESyj+QUAKVX+HprxtuKegnYsDrtz/qKzarNjdkf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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