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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ba9864c92288f6fdb9f203e1aa3ebe18cfe90cc7705fe543a715dbbc8fad70' 
  AND token = 'lgWZnonFiPnQcENIMpN9TcerngMESbonkdr19ors0XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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