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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f999e53716c907643bedb2c530f4f16bfd78302eb738f0b95f6a1d730ab7b7' 
  AND token = 'NR3EDYxaVglXEUNF6iJyQghKujWQ6wj48JfO9V1yZ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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