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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b89d9f74049202e01d06cfb8f38d7cd427c81bb10a884485f3be5d21e138a72' 
  AND token = 'FHwqdv/i/BNd+FPGEyOHaNlIfW1jsejfw2UOGfVEuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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