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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f96042cd555e038ca75cfb15dc3a4c47984e9fa7906aaf6cc7f624879b57b11' 
  AND token = 'dCwjkfhsGPez101SVGUszkhJyhQjo27VOzryzly9ozk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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