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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5882fa9c6cbd4f07c46a34b010256e848159be88945789013363720a54f4f6' 
  AND token = 'SuOrZgaLljd5lq+a4VEFmpluiOGi/2euGYiyQ0CQiak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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