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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5619db5058769d5b879da160cfda5593ce907d3fd8f337a56470b7235342fcc8' 
  AND token = 'noM5nqrt4ABpS0Yw6nTG59C975vl3H3SEteeovnWKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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