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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b26ff0933a92b4b6f8e353d26e2f2d14da85aabf3e44f688220e0d1d89c671' 
  AND token = 'eTMiDAStIvBOMO9YUeBOZo6uHYvR0KpTt+tLiQhOnFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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