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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4ca6bdb76a22541f8c6d16f22feffe6a277c77420e9485786e22b4937772d' 
  AND token = 'jkt9Y57tly5T2u3kvSkfrjH8ne7ddUGYxtNCHKOnUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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