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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a5d987a65693945cf4f8382f21dbdae3d87b1e8bcc700b00c921dc374c52fe' 
  AND token = 'LuloeorFHTa7tCdfIcF1vYXogd8GRVYc7OXtz7T/Q1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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