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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae7ba6928b1efbf2952007ff01f655cc39dedb2703d5a858396d0f605ce8aaa' 
  AND token = 'zwDgQvopY8Pcmj9iPqLvRHrwZBxaLt/3IdBWB0tY1ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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