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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5323128b3a3d3cc2b9829cfda351851c69cdfba99f6d8d1c881ca1f4834816e1' 
  AND token = 'lNKJyHMAnd2K853/GEH5q7EjEk9yj+mIk1uXKrywO+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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