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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808d8b5b008d7036d2430dcc481ff2efcc84572ae80e4cf8da2e70743a440056' 
  AND token = 'LnCjxB1zz5MqeIhqakWdzGkZWkQ/25tGBIy1e5n8GHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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