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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2c87f9c5b3dd3884713e3d79783ff4cb3163d43a26466853e8f498c64eff43' 
  AND token = '4Y4pcZ0ETtMuG5YxzTNBbH0krBslui15rOb/2pn5O2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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