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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68eb6df866fa40549ea1cc0dfc71929b1b4ff936e90f49a47711735e1b8dc530' 
  AND token = 'mcTR+p6hQu7qPAukmFMX8ms1RqvUD7DDsUYlfeiJcDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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