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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0a77c65fb4c65b768eb077b1e64419c7541d2715f3299fdd358d348a740f59' 
  AND token = '7rmWDumdx5w0CqheCwz47wXl4YVHpaaIa0Mu5Gvu2yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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