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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee912f19c367e34aa576bf1448a8347a42e4de41d5701eedf10c8bb4f16bf1e' 
  AND token = 'xQXkg0W6Vj+opS8XIKM/nL5hsX+/l6m1Is9FZGf98u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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