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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcfa6cb894cd96d1328ab3ac9c95042ffe18a6ab8e55930e3b61b10ab0168fd' 
  AND token = 'mfaAlsWOuzhd4bfFxxpX4Se6A6EpHNKt8rPaSNLUmoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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