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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1009c73ff88a1640e5cc6396725a8ebeffe6ab5d6f8ef2a32d707dde615f39' 
  AND token = 'yubAda15/hSEnK3vT8dsCJnNsX2wIngiv434+YqI3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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