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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799a6f782bab38d98c81734355314a93bf65f56d97e9508bec1b0087b95e7536' 
  AND token = '3FMXpjtWqNdwPH5q+fvTrl3/HyU7Cck3Z2LPSOdPCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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