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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078aeb379de83bf24610fef563f0ab1db88311cfcdf56ecb0dfeb7ca37ba1638' 
  AND token = 'n4Z9xYeN7fl63u+NAb1S2j2u126fxDwCx3eQjdM/NuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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