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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a6e9fb004f6a172819301457eeb5c88ad16efe61449f87eb68babddae55f76' 
  AND token = '7Kxi/MjjMxcnsJCTZKKulfQZLDvwXe9DEdiXHrpJfRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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