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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae87a2b6a79d8859b261a7897c1fc3acd67cafb7bfaf61617e6ed678c7b9c2da' 
  AND token = 'nIeiOk4N8MetWBurT5OnwOQIukFnffawjMzbK6L6O2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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