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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f38c5d18b7d86e00e6303227c3238bfa0c983ea035a5b8faa4aee038d090a7' 
  AND token = 'W4vJgD9aWZ5yPBLoQ+5ObOr1xLTre4IVHr0wdg4u8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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