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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1be29691e408cecb6426ad7c6ec73a29ddd58380ab5cc66b6a0f5fa068c23d7' 
  AND token = 'u+eTg7aG1X+g0vta6NOVWmkJiepYvw7PIn62e2ENYbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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