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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5f6d5e39720cad75c90918bfdf6b99c036c111e9a92a14ef49af241c1d622e' 
  AND token = 'NHC39CbEviqY1Peg0uPZaREjiAgoBhfyJY7G7btksTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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