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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2fe0a7d0fdf30be629f5a89b95b41b2469e0c1f11b48303f2628435d2a7e06' 
  AND token = 'LZr6szheiBxy1zAbobqmM4185Mgu7/snFMKcSm0+3XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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