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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e57221e6ee2887bca38357d39759b7afcc9605ed7f13705fa75849d55c682a1' 
  AND token = 'ssBXiuEq6+rDnVMZV6A1bTQO8vD2iVuL0qZo/RnO+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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