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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca76c42943fafea2c3a356d03c50cfe4fdddc23e8a5eeae7aacd4c4b34c4d9e7' 
  AND token = '/xaMjdYNBsOFN/Ww7xFgVe+0AOmF3pmfCkLS4t6MNVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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