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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3068fb279189b55802aec729b7b00c829cd082f0811480ec80487dc15c0e72cd' 
  AND token = 'Tb0wcl8J+1z/+hjU/MFmMZmY8ZPa6aZXyGqilLd8ITA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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