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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5f1d74a62bc4eb93aeca37c46703a187626c3fff3a1cc16848fe9666827ded' 
  AND token = 'X6hRnpNWPRpgS0JoWpWhmvi63cCy7JuhhIOfq166ETA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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