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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372c3cb0c10f0e2e7a223de1ddb6149f94f9d6a47152e3714dda2d878c93a37d' 
  AND token = '+Xr/9OLbQ+BtrpNdxl+Rwqmo0jt0dKEJfTsN6dQEhlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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