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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db0e91aa77ed42b846eb6f549ae6c1e9b1fcdddcf213fbbfc8fc70fc2078031' 
  AND token = 'jN7fsYfB3BB+zSpkdvPISWyMpihawLUAT/osfojo8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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