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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7ce9a7d688f0e2f952daa649130f98bea8620fb0c54f693ee1750e65949f2e' 
  AND token = 'NI6E3+jZNEtukq/GW7+J4Sry88P5h3WptG7I6trZpE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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