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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28934ef2eed0d094004a8417e7f2ee7795dba647d6874e0189681b6df8ea2c0' 
  AND token = '9A5AfegZgD/9RMV3ll5ylT+AhmVNGmgx2nT8jgemNJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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