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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369fb3b2704b8c0296497df6f54589cfe6517d05bcd9ef8c9642e3996de8eb72' 
  AND token = 'qzI1IBGTgRm8kyCSkUWyu/tVQ8xLbNOQ2XYas5L6S8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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