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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8971a86dd782aeda8ff33e4bd9a58e4c2919ee924142088baee11c61cc46108c' 
  AND token = 's+fAc0N90pwoBN2ayfdnxX2ad7Wy11RmxDhgcwS2gWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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